MXenes公司
二价
电化学
水溶液
材料科学
选择性
离子
碳化钛
碱金属
离子键合
无机化学
电极
离子交换
化学工程
化学
钛
纳米技术
物理化学
催化作用
有机化学
冶金
工程类
生物化学
作者
Lei Wang,Mohammad Torkamanzadeh,Ahmad Majed,Yuan Zhang,Qingsong Wang,Guang Feng,Michael Naguib,Volker Presser
标识
DOI:10.1002/adsu.202100383
摘要
Abstract Electrochemical ion separation is a promising technology to recover valuable ionic species from water. Pseudocapacitive materials, especially 2D materials, are up‐and‐coming electrodes for electrochemical ion separation. For implementation, it is essential to understand the interplay of the intrinsic preference of a specific ion (by charge/size), kinetic ion preference (by mobility), and crystal structure changes. Ti 3 C 2 T z MXene is chosen here to investigate its selective behavior toward alkali and alkaline earth cations. Utilizing an online inductively coupled plasma system, it is found that Ti 3 C 2 T z shows a time‐dependent selectivity feature. In the early stage of charging (up to about 50 min), K + is preferred, while ultimately Ca 2+ and Mg 2+ uptake dominate; this unique phenomenon is related to dehydration energy barriers and the ion exchange effect between divalent and monovalent cations. Given the wide variety of MXenes, this work opens the door to a new avenue where selective ion‐separation with MXene can be further engineered and optimized.
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